Hello, Just switched from docker desktop to rancher desktop. I am using

dockerd

on macOS 12.6. I am trying to expose port 53 in the container as 5300 on the host. The docker-compose contains this:

ports:
      - 192.168.0.18:5300:53/udp

I receive the error message:

Error starting userland proxy: listen udp4 192.168.0.18:5300: bind: cannot assign requested address

If I expose 80 as 8080 for nginx, via

docker run --name some-nginx -d -p 8080:80 nginx

, however, then I can access 192.168.0.18:8080 without a problem.

Just use docker image, but don't use docker run.

I'm not using kubernetes, I just want to run two containers from a docker-compose stack

wondering if it might be a udp thing. if you go tcp does it work?

Yeah, a DNS query over TCP on port 5300 from the host works

may be a limitation of the forwarding into the VM because its connectionless

ah yes, couldn't find that earlier

won’t be as performant, but most named will support tcp. it is a bit of a change for the consumers though so it may not be a workable option

it does, and luckily I am only putting a few thousand queries per second through it - I'll probably have to switch to docker engine on a separate box or back to docker desktop, I guess!